We just replaced these RE760 Sports this weekend due to a flat. The backs were completely toast, and the fronts had 3/32" left.
The tires had 28k, but could have made it to 30k.
We replaced them with another set of RE760 sports. Also got an alignment this time since the LR tire had some nasty nasty wear. Now that the vehicle is aligned (all of the toe adjustments were far less than ideal), hopefully this set will last even longer.
Also, it turned out that America's tire installed the wrong size last time. They installed 225/45-18 last time when they should have installed 225/40-18. I had noticed a different load index on the new tires during the installation, and that's how I discovered this error. The car rides a lot stiffer on the correct 225/40-18 RE760 sports, LOL.